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class="sidebar-heading"><span>实战案例</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/md/concurrent/ActualCombat/default.html" class="sidebar-link">关于我</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>面试</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/md/concurrent/interview/default.html" class="sidebar-link">关于我</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>系统架构</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/md/concurrent/framework/default.html" class="sidebar-link">关于我</a></li></ul></section></li></ul> </aside> <div><main class="page"> <div class="theme-default-content content__default"><h1 id="【高并发】通过threadpoolexecutor类的源码深度解析线程池执行任务的核心流程"><a href="#【高并发】通过threadpoolexecutor类的源码深度解析线程池执行任务的核心流程" class="header-anchor">#</a> 【高并发】通过ThreadPoolExecutor类的源码深度解析线程池执行任务的核心流程</h1> <h3 id="核心逻辑概述"><a href="#核心逻辑概述" class="header-anchor">#</a> 核心逻辑概述</h3> <p>ThreadPoolExecutor是Java线程池中最核心的类之一，它能够保证线程池按照正常的业务逻辑执行任务，并通过原子方式更新线程池每个阶段的状态。</p> <p>ThreadPoolExecutor类中存在一个workers工作线程集合，用户可以向线程池中添加需要执行的任务，workers集合中的工作线程可以直接执行任务，或者从任务队列中获取任务后执行。ThreadPoolExecutor类中提供了整个线程池从创建到执行任务，再到消亡的整个流程方法。本文，就结合ThreadPoolExecutor类的源码深度分析线程池执行任务的整体流程。</p> <p>在ThreadPoolExecutor类中，线程池的逻辑主要体现在execute(Runnable)方法，addWorker(Runnable, boolean)方法，addWorkerFailed(Worker)方法和拒绝策略上，接下来，我们就深入分析这几个核心方法。</p> <h3 id="execute-runnable-方法"><a href="#execute-runnable-方法" class="header-anchor">#</a> execute(Runnable)方法</h3> <p>execute(Runnable)方法的作用是提交Runnable类型的任务到线程池中。我们先看下execute(Runnable)方法的源码，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">execute</span><span class="token punctuation">(</span><span class="token class-name">Runnable</span> command<span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">//如果提交的任务为空，则抛出空指针异常</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span>command <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
		<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">NullPointerException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">//获取线程池的状态和线程池中线程的数量</span>
	<span class="token keyword">int</span> c <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">//线程池中的线程数量小于corePoolSize的值</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">workerCountOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">&lt;</span> corePoolSize<span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token comment">//重新开启线程执行任务</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">addWorker</span><span class="token punctuation">(</span>command<span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
			<span class="token keyword">return</span><span class="token punctuation">;</span>
		c <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token comment">//如果线程池处于RUNNING状态，则将任务添加到阻塞队列中</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isRunning</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> workQueue<span class="token punctuation">.</span><span class="token function">offer</span><span class="token punctuation">(</span>command<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token comment">//再次获取线程池的状态和线程池中线程的数量，用于二次检查</span>
		<span class="token keyword">int</span> recheck <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token comment">//如果线程池没有未处于RUNNING状态，从队列中删除任务</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span> <span class="token function">isRunning</span><span class="token punctuation">(</span>recheck<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> <span class="token function">remove</span><span class="token punctuation">(</span>command<span class="token punctuation">)</span><span class="token punctuation">)</span>
			<span class="token comment">//执行拒绝策略</span>
			<span class="token function">reject</span><span class="token punctuation">(</span>command<span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token comment">//如果线程池为空，则向线程池中添加一个线程</span>
		<span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">workerCountOf</span><span class="token punctuation">(</span>recheck<span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span>
			<span class="token function">addWorker</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token comment">//任务队列已满，则新增worker线程，如果新增线程失败，则执行拒绝策略</span>
	<span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">addWorker</span><span class="token punctuation">(</span>command<span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
		<span class="token function">reject</span><span class="token punctuation">(</span>command<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br></div></div><p>整个任务的执行流程，我们可以简化成下图所示。</p> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200224163214685.png" loading="lazy" class="lazy"></p> <p>接下来，我们拆解execute(Runnable)方法，具体分析execute(Runnable)方法的执行逻辑。</p> <p>（1）线程池中的线程数是否小于corePoolSize核心线程数，如果小于corePoolSize核心线程数，则向workers工作线程集合中添加一个核心线程执行任务。代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//线程池中的线程数量小于corePoolSize的值</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">workerCountOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">&lt;</span> corePoolSize<span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">//重新开启线程执行任务</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">addWorker</span><span class="token punctuation">(</span>command<span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
		<span class="token keyword">return</span><span class="token punctuation">;</span>
	c <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p>（2）如果线程池中的线程数量大于corePoolSize核心线程数，则判断当前线程池是否处于RUNNING状态，如果处于RUNNING状态，则添加任务到待执行的任务队列中。注意：这里向任务队列添加任务时，需要判断线程池是否处于RUNNING状态，只有线程池处于RUNNING状态时，才能向任务队列添加新任务。否则，会执行拒绝策略。代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isRunning</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> workQueue<span class="token punctuation">.</span><span class="token function">offer</span><span class="token punctuation">(</span>command<span class="token punctuation">)</span><span class="token punctuation">)</span> 
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>（3）向任务队列中添加任务成功，由于其他线程可能会修改线程池的状态，所以这里需要对线程池进行二次检查，如果当前线程池的状态不再是RUNNING状态，则需要将添加的任务从任务队列中移除，执行后续的拒绝策略。如果当前线程池仍然处于RUNNING状态，则判断线程池是否为空，如果线程池中不存在任何线程，则新建一个线程添加到线程池中，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//再次获取线程池的状态和线程池中线程的数量，用于二次检查</span>
<span class="token keyword">int</span> recheck <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//如果线程池没有未处于RUNNING状态，从队列中删除任务</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span> <span class="token function">isRunning</span><span class="token punctuation">(</span>recheck<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> <span class="token function">remove</span><span class="token punctuation">(</span>command<span class="token punctuation">)</span><span class="token punctuation">)</span>
	<span class="token comment">//执行拒绝策略</span>
	<span class="token function">reject</span><span class="token punctuation">(</span>command<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//如果线程池为空，则向线程池中添加一个线程</span>
<span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">workerCountOf</span><span class="token punctuation">(</span>recheck<span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span>
	<span class="token function">addWorker</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>（4）如果在步骤（3）中向任务队列中添加任务失败，则尝试开启新的线程执行任务。此时，如果线程池中的线程数量已经大于线程池中的最大线程数maximumPoolSize，则不能再启动新线程。此时，表示线程池中的任务队列已满，并且线程池中的线程已满，需要执行拒绝策略，代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//任务队列已满，则新增worker线程，如果新增线程失败，则执行拒绝策略</span>
<span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">addWorker</span><span class="token punctuation">(</span>command<span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
	<span class="token function">reject</span><span class="token punctuation">(</span>command<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>这里，我们将execute(Runnable)方法拆解，结合流程图来理解线程池中任务的执行流程就比较简单了。可以这么说，execute(Runnable)方法的逻辑基本上就是一般线程池的执行逻辑，理解了execute(Runnable)方法，就基本理解了线程池的执行逻辑。</p> <p><strong>注意：有关<strong><strong>ScheduledThreadPoolExecutor</strong></strong>类和<strong><strong>ForkJoinPool</strong></strong>类执行线程池的逻辑，在【高并发专题】系列文章中的后文中会详细说明，理解了这些类的执行逻辑，就基本全面掌握了线程池的执行流程。</strong></p> <p>在分析execute(Runnable)方法的源码时，我们发现execute(Runnable)方法中多处调用了addWorker(Runnable, boolean)方法，接下来，我们就一起分析下addWorker(Runnable, boolean)方法的逻辑。</p> <h3 id="addworker-runnable-boolean-方法"><a href="#addworker-runnable-boolean-方法" class="header-anchor">#</a> addWorker(Runnable, boolean)方法</h3> <p>总体上，addWorker(Runnable, boolean)方法可以分为三部分，第一部分是使用CAS安全的向线程池中添加工作线程；第二部分是创建新的工作线程；第三部分则是将任务通过安全的并发方式添加到workers中，并启动工作线程执行任务。</p> <p>接下来，我们看下addWorker(Runnable, boolean)方法的源码，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">private</span> <span class="token keyword">boolean</span> <span class="token function">addWorker</span><span class="token punctuation">(</span><span class="token class-name">Runnable</span> firstTask<span class="token punctuation">,</span> <span class="token keyword">boolean</span> core<span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">//标记重试的标识</span>
	retry<span class="token operator">:</span>
	<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token punctuation">;</span><span class="token punctuation">;</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">int</span> c <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">int</span> rs <span class="token operator">=</span> <span class="token function">runStateOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">;</span>

		<span class="token comment">// 检查队列是否在某些特定的条件下为空</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span>rs <span class="token operator">&gt;=</span> SHUTDOWN <span class="token operator">&amp;&amp;</span>
			<span class="token operator">!</span> <span class="token punctuation">(</span>rs <span class="token operator">==</span> SHUTDOWN <span class="token operator">&amp;&amp;</span>
			   firstTask <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span>
			   <span class="token operator">!</span> workQueue<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
			<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
		<span class="token comment">//下面循环的主要作用为通过CAS方式增加线程的个数</span>
		<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token punctuation">;</span><span class="token punctuation">;</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token comment">//获取线程池中的线程数量</span>
			<span class="token keyword">int</span> wc <span class="token operator">=</span> <span class="token function">workerCountOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token comment">//如果线程池中的线程数量超出限制，直接返回false</span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span>wc <span class="token operator">&gt;=</span> CAPACITY <span class="token operator">||</span>
				wc <span class="token operator">&gt;=</span> <span class="token punctuation">(</span>core <span class="token operator">?</span> corePoolSize <span class="token operator">:</span> maximumPoolSize<span class="token punctuation">)</span><span class="token punctuation">)</span>
				<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
			<span class="token comment">//通过CAS方式向线程池新增线程数量</span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">compareAndIncrementWorkerCount</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">)</span>
				<span class="token comment">//通过CAS方式保证只有一个线程执行成功，跳出最外层循环</span>
				<span class="token keyword">break</span> retry<span class="token punctuation">;</span>
			<span class="token comment">//重新获取ctl的值</span>
			c <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  
			<span class="token comment">//如果CAS操作失败了，则需要在内循环中重新尝试通过CAS新增线程数量</span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">runStateOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">!=</span> rs<span class="token punctuation">)</span>
				<span class="token keyword">continue</span> retry<span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span>
	
	<span class="token comment">//跳出最外层for循环，说明通过CAS新增线程数量成功</span>
	<span class="token comment">//此时创建新的工作线程</span>
	<span class="token keyword">boolean</span> workerStarted <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
	<span class="token keyword">boolean</span> workerAdded <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
	<span class="token class-name">Worker</span> w <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
	<span class="token keyword">try</span> <span class="token punctuation">{</span>
		<span class="token comment">//将执行的任务封装成worker</span>
		w <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Worker</span><span class="token punctuation">(</span>firstTask<span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">final</span> <span class="token class-name">Thread</span> t <span class="token operator">=</span> w<span class="token punctuation">.</span>thread<span class="token punctuation">;</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span>t <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token comment">//独占锁，保证操作workers时的同步</span>
			<span class="token keyword">final</span> <span class="token class-name">ReentrantLock</span> mainLock <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mainLock<span class="token punctuation">;</span>
			mainLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token keyword">try</span> <span class="token punctuation">{</span>
				<span class="token comment">//此处需要重新检查线程池状态</span>
				<span class="token comment">//原因是在获得锁之前可能其他的线程改变了线程池的状态</span>
				<span class="token keyword">int</span> rs <span class="token operator">=</span> <span class="token function">runStateOf</span><span class="token punctuation">(</span>ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				
				<span class="token keyword">if</span> <span class="token punctuation">(</span>rs <span class="token operator">&lt;</span> SHUTDOWN <span class="token operator">||</span>
					<span class="token punctuation">(</span>rs <span class="token operator">==</span> SHUTDOWN <span class="token operator">&amp;&amp;</span> firstTask <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
					<span class="token keyword">if</span> <span class="token punctuation">(</span>t<span class="token punctuation">.</span><span class="token function">isAlive</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
						<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalThreadStateException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
					<span class="token comment">//向worker中添加新任务</span>
					workers<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>w<span class="token punctuation">)</span><span class="token punctuation">;</span>
					<span class="token keyword">int</span> s <span class="token operator">=</span> workers<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
					<span class="token keyword">if</span> <span class="token punctuation">(</span>s <span class="token operator">&gt;</span> largestPoolSize<span class="token punctuation">)</span>
						largestPoolSize <span class="token operator">=</span> s<span class="token punctuation">;</span>
					<span class="token comment">//将是否添加了新任务的标识设置为true</span>
					workerAdded <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
				<span class="token punctuation">}</span>
			<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
				<span class="token comment">//释放独占锁</span>
				mainLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">}</span>
			<span class="token comment">//添加新任成功，则启动线程执行任务</span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span>workerAdded<span class="token punctuation">)</span> <span class="token punctuation">{</span>
				t<span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token comment">//将任务是否已经启动的标识设置为true</span>
				workerStarted <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
			<span class="token punctuation">}</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
		<span class="token comment">//如果任务未启动或启动失败，则调用addWorkerFailed(Worker)方法</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span> workerStarted<span class="token punctuation">)</span>
			<span class="token function">addWorkerFailed</span><span class="token punctuation">(</span>w<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token comment">//返回是否启动任务的标识</span>
	<span class="token keyword">return</span> workerStarted<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br><span class="line-number">74</span><br><span class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br></div></div><p>乍一看，addWorker(Runnable, boolean)方法还蛮长的，这里，我们还是将addWorker(Runnable, boolean)方法进行拆解。</p> <p>（1）检查任务队列是否在某些特定的条件下为空，代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">// 检查队列是否在某些特定的条件下为空</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>rs <span class="token operator">&gt;=</span> SHUTDOWN <span class="token operator">&amp;&amp;</span>
	<span class="token operator">!</span> <span class="token punctuation">(</span>rs <span class="token operator">==</span> SHUTDOWN <span class="token operator">&amp;&amp;</span>
	   firstTask <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span>
	   <span class="token operator">!</span> workQueue<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
	<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>（2）在通过步骤（1）的校验后，则进入内层for循环，在内层for循环中通过CAS来增加线程池中的线程数量，如果CAS操作成功，则直接退出双重for循环。如果CAS操作失败，则查看当前线程池的状态是否发生了变化，如果线程池的状态发生了变化，则通过continue关键字重新通过外层for循环校验任务队列，检验通过再次执行内层for循环的CAS操作。如果线程池的状态没有发生变化，此时上一次CAS操作失败了，则继续尝试CAS操作。代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token punctuation">;</span><span class="token punctuation">;</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">//获取线程池中的线程数量</span>
	<span class="token keyword">int</span> wc <span class="token operator">=</span> <span class="token function">workerCountOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">//如果线程池中的线程数量超出限制，直接返回false</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span>wc <span class="token operator">&gt;=</span> CAPACITY <span class="token operator">||</span>
		wc <span class="token operator">&gt;=</span> <span class="token punctuation">(</span>core <span class="token operator">?</span> corePoolSize <span class="token operator">:</span> maximumPoolSize<span class="token punctuation">)</span><span class="token punctuation">)</span>
		<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
	<span class="token comment">//通过CAS方式向线程池新增线程数量</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">compareAndIncrementWorkerCount</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">)</span>
		<span class="token comment">//通过CAS方式保证只有一个线程执行成功，跳出最外层循环</span>
		<span class="token keyword">break</span> retry<span class="token punctuation">;</span>
	<span class="token comment">//重新获取ctl的值</span>
	c <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  
	<span class="token comment">//如果CAS操作失败了，则需要在内循环中重新尝试通过CAS新增线程数量</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">runStateOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">!=</span> rs<span class="token punctuation">)</span>
		<span class="token keyword">continue</span> retry<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br></div></div><p>（3）CAS操作成功后，表示向线程池中成功添加了工作线程，此时，还没有线程去执行任务。使用全局的独占锁mainLock来将新增的工作线程Worker对象安全的添加到workers中。</p> <p>总体逻辑就是：创建新的Worker对象，并获取Worker对象中的执行线程，如果线程不为空，则获取独占锁，获取锁成功后，再次检查线线程的状态，这是避免在获取独占锁之前其他线程修改了线程池的状态，或者关闭了线程池。如果线程池关闭，则需要释放锁。否则将新增加的线程添加到工作集合中，释放锁并启动线程执行任务。将是否启动线程的标识设置为true。最后，判断线程是否启动，如果没有启动，则调用addWorkerFailed(Worker)方法。最终返回线程是否起送的标识。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//跳出最外层for循环，说明通过CAS新增线程数量成功</span>
<span class="token comment">//此时创建新的工作线程</span>
<span class="token keyword">boolean</span> workerStarted <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token keyword">boolean</span> workerAdded <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token class-name">Worker</span> w <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
	<span class="token comment">//将执行的任务封装成worker</span>
	w <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Worker</span><span class="token punctuation">(</span>firstTask<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">final</span> <span class="token class-name">Thread</span> t <span class="token operator">=</span> w<span class="token punctuation">.</span>thread<span class="token punctuation">;</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span>t <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token comment">//独占锁，保证操作workers时的同步</span>
		<span class="token keyword">final</span> <span class="token class-name">ReentrantLock</span> mainLock <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mainLock<span class="token punctuation">;</span>
		mainLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">try</span> <span class="token punctuation">{</span>
			<span class="token comment">//此处需要重新检查线程池状态</span>
			<span class="token comment">//原因是在获得锁之前可能其他的线程改变了线程池的状态</span>
			<span class="token keyword">int</span> rs <span class="token operator">=</span> <span class="token function">runStateOf</span><span class="token punctuation">(</span>ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			
			<span class="token keyword">if</span> <span class="token punctuation">(</span>rs <span class="token operator">&lt;</span> SHUTDOWN <span class="token operator">||</span>
				<span class="token punctuation">(</span>rs <span class="token operator">==</span> SHUTDOWN <span class="token operator">&amp;&amp;</span> firstTask <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
				<span class="token keyword">if</span> <span class="token punctuation">(</span>t<span class="token punctuation">.</span><span class="token function">isAlive</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
					<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalThreadStateException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token comment">//向worker中添加新任务</span>
				workers<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>w<span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token keyword">int</span> s <span class="token operator">=</span> workers<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token keyword">if</span> <span class="token punctuation">(</span>s <span class="token operator">&gt;</span> largestPoolSize<span class="token punctuation">)</span>
					largestPoolSize <span class="token operator">=</span> s<span class="token punctuation">;</span>
				<span class="token comment">//将是否添加了新任务的标识设置为true</span>
				workerAdded <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
			<span class="token punctuation">}</span>
		<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
			<span class="token comment">//释放独占锁</span>
			mainLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
		<span class="token comment">//添加新任成功，则启动线程执行任务</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span>workerAdded<span class="token punctuation">)</span> <span class="token punctuation">{</span>
			t<span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token comment">//将任务是否已经启动的标识设置为true</span>
			workerStarted <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
	<span class="token comment">//如果任务未启动或启动失败，则调用addWorkerFailed(Worker)方法</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span> workerStarted<span class="token punctuation">)</span>
		<span class="token function">addWorkerFailed</span><span class="token punctuation">(</span>w<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">//返回是否启动任务的标识</span>
<span class="token keyword">return</span> workerStarted<span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br></div></div><h3 id="addworkerfailed-worker-方法"><a href="#addworkerfailed-worker-方法" class="header-anchor">#</a> addWorkerFailed(Worker)方法</h3> <p>在addWorker(Runnable, boolean)方法中，如果添加工作线程失败或者工作线程启动失败时，则会调用addWorkerFailed(Worker)方法，下面我们就来看看addWorkerFailed(Worker)方法的实现，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">addWorkerFailed</span><span class="token punctuation">(</span><span class="token class-name">Worker</span> w<span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">//获取独占锁</span>
	<span class="token keyword">final</span> <span class="token class-name">ReentrantLock</span> mainLock <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mainLock<span class="token punctuation">;</span>
	mainLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">try</span> <span class="token punctuation">{</span>
		<span class="token comment">//如果Worker任务不为空</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span>w <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
			<span class="token comment">//将任务从workers集合中移除</span>
			workers<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span>w<span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token comment">//通过CAS将任务数量减1</span>
		<span class="token function">decrementWorkerCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token function">tryTerminate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
		<span class="token comment">//释放锁</span>
		mainLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br></div></div><p>addWorkerFailed(Worker)方法的逻辑就比较简单了，获取独占锁，将任务从workers中移除，并且通过CAS将任务的数量减1，最后释放锁。</p> <h3 id="拒绝策略"><a href="#拒绝策略" class="header-anchor">#</a> 拒绝策略</h3> <p>我们在分析execute(Runnable)方法时，线程池会在适当的时候调用reject(Runnable)方法来执行相应的拒绝策略，我们看下reject(Runnable)方法的实现，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">final</span> <span class="token keyword">void</span> <span class="token function">reject</span><span class="token punctuation">(</span><span class="token class-name">Runnable</span> command<span class="token punctuation">)</span> <span class="token punctuation">{</span>
	handler<span class="token punctuation">.</span><span class="token function">rejectedExecution</span><span class="token punctuation">(</span>command<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>通过代码，我们发现调用的是handler的rejectedExecution方法，handler又是个什么鬼，我们继续跟进代码，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">private</span> <span class="token keyword">volatile</span> <span class="token class-name">RejectedExecutionHandler</span> handler<span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>再看看RejectedExecutionHandler是个啥类型，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent</span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">RejectedExecutionHandler</span> <span class="token punctuation">{</span>

    <span class="token keyword">void</span> <span class="token function">rejectedExecution</span><span class="token punctuation">(</span><span class="token class-name">Runnable</span> r<span class="token punctuation">,</span> <span class="token class-name">ThreadPoolExecutor</span> executor<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>可以发现RejectedExecutionHandler是个接口，定义了一个rejectedExecution(Runnable, ThreadPoolExecutor)方法。既然RejectedExecutionHandler是个接口，那我们就看看有哪些类实现了RejectedExecutionHandler接口。</p> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200224163916175.png" loading="lazy" class="lazy"></p> <p>看到这里，我们发现RejectedExecutionHandler接口的实现类正是线程池默认提供的四种拒绝策略的实现类。</p> <p>至于reject(Runnable)方法中具体会执行哪个类的拒绝策略，是根据创建线程池时传递的参数决定的。如果没有传递拒绝策略，则默认会执行AbortPolicy类的拒绝策略。否则会执行传递的类的拒绝策略。</p> <p>在创建线程池时，除了能够传递JDK默认提供的拒绝策略外，还可以传递自定义的拒绝策略。如果想使用自定义的拒绝策略，则只需要实现RejectedExecutionHandler接口，并重写rejectedExecution(Runnable, ThreadPoolExecutor)方法即可。例如，下面的代码。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">CustomPolicy</span> <span class="token keyword">implements</span> <span class="token class-name">RejectedExecutionHandler</span> <span class="token punctuation">{</span>

	<span class="token keyword">public</span> <span class="token class-name">CustomPolicy</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token punctuation">}</span>

	<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">rejectedExecution</span><span class="token punctuation">(</span><span class="token class-name">Runnable</span> r<span class="token punctuation">,</span> <span class="token class-name">ThreadPoolExecutor</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>e<span class="token punctuation">.</span><span class="token function">isShutdown</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;使用调用者所在的线程来执行任务&quot;</span><span class="token punctuation">)</span>
			r<span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p>使用如下方式创建线程池。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">new</span> <span class="token class-name">ThreadPoolExecutor</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token class-name">Integer</span><span class="token punctuation">.</span>MAX_VALUE<span class="token punctuation">,</span>
                       <span class="token number">60L</span><span class="token punctuation">,</span> <span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>SECONDS<span class="token punctuation">,</span>
                       <span class="token keyword">new</span> <span class="token class-name">SynchronousQueue</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Runnable</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
                       <span class="token class-name">Executors</span><span class="token punctuation">.</span><span class="token function">defaultThreadFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
		       <span class="token keyword">new</span> <span class="token class-name">CustomPolicy</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>至此，线程池执行任务的整体核心逻辑分析结束。</p> <h2 id="写在最后"><a href="#写在最后" class="header-anchor">#</a> 写在最后</h2> <blockquote><p>如果觉得文章对你有点帮助，请微信搜索并关注「 <strong>冰河技术</strong> 」微信公众号，跟冰河学习高并发编程技术。</p></blockquote> <p>最后，附上并发编程需要掌握的核心技能知识图，祝大家在学习并发编程时，少走弯路。</p> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200322144644983.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2wxMDI4Mzg2ODA0,size_16,color_FFFFFF,t_70#pic_center" loading="lazy" class="lazy"></p> <blockquote><p>如果你觉得冰河写的还不错，请微信搜索并关注「 <strong>冰河技术</strong> 」微信公众号，跟冰河学习高并发、分布式、微服务、大数据、互联网和云原生技术，「 <strong>冰河技术</strong> 」微信公众号更新了大量技术专题，每一篇技术文章干货满满！不少读者已经通过阅读「 <strong>冰河技术</strong> 」微信公众号文章，吊打面试官，成功跳槽到大厂；也有不少读者实现了技术上的飞跃，成为公司的技术骨干！如果你也想像他们一样提升自己的能力，实现技术能力的飞跃，进大厂，升职加薪，那就关注「 <strong>冰河技术</strong> 」微信公众号吧，每天更新超硬核技术干货，让你对如何提升技术能力不再迷茫！</p></blockquote> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200906013715889.png" loading="lazy" class="lazy"></p></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/binghe001/BingheGuide/edit/master/docs/md/concurrent/source/2020-03-30-010-通过ThreadPoolExecutor类的源码深度解析线程池执行任务的核心流程.md" target="_blank" rel="noopener noreferrer">在 GitHub 上编辑此页</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">上次更新: </span> <span class="time">2022/5/23</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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